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Conductive material and its manufacture thereof

a technology of conductive materials and thin strips, which is applied in the field of conductive materials, can solve the problems of increasing discussion about radio wave interference in communication equipment, difficulty in cutting materials into thin strips with a specified width in a predetermined direction, and electromagnetic waves generated by electronics devices and equipment, etc., and achieves the effects of low cost, stable quality and easy manufacturing

Inactive Publication Date: 2003-05-27
SEIREN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The conductive material, or especially the electromagnetic wave shield gasket material according to this invention can be manufactured easily with low cost and with stable quality. This material exhibits the same performance in spite of the fact that the manual labor is eliminated of coating an adhesive on a metallized cloth and winding it around a preformed rectangular parallelopipedal foamed polyurethane. Also, the conventional metal-plated foamed polyurethane cannot be sufficiently slitted because of an extremely low tensile strength along the length thereof. The fabrication method according to the present invention, in contrast, has no problem of the tension acting along the length in the process of plating or coating the adhesive, thereby facilitating the processing operation.Further even after the product is slitted into the form of thin tape, a sufficient lengthwise strength is maintained and thereby the continuous processing is made possible in all the steps of productions.

Problems solved by technology

With the expansion of the use of these equipment from industrial fields to home applications, the problem that the electromagnetic wave leaking from these equipment may cause an operation error of other electronics equipment and radio wave interference for communication equipment has become an increasingly serious subject of discussion in mass media.
Generally, an especially serious problem of the electromagnetic wave generated from electronics devices and equipment derives from the electromagnetic wave leaking from the joints of the parts constituting a housing of the equipment and from the gaps between the doors mounted on the housing.
The foamed urethane material actually used, however, because of its high flexibility and cushion property, is materially so weak that the work of cutting the material into a thin strip with a specified width in a predetermined direction is considerably difficult from the technical standpoint.
This manufacturing process requires considerable labor, resulting in an increased production cost.

Method used

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  • Conductive material and its manufacture thereof
  • Conductive material and its manufacture thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

A spun bonded nonwoven cloth (40 g / m.sup.2 in weight) composed of polyester long fiber (single thread denier of 2.0 d) was bonded with a foamed polyurethane sheet 1.6 mm thick having a cell density of 40 per inch by melt-bonding to produce a composite material 1.3 mm thick.

After the composite material is sufficiently cleaned, it was immersed for two minutes in a 40.degree. C. aqueous solution containing 0.3 g / L palladium chloride, 30 g / L stannous chloride and 300 ml / L 36% hydrochloric acid, and washed in water. The resulting material was immersed in 10% sulfuric acid for five minutes at 30.degree. C., and washed in water.

Further, the material was immersed for 5 minutes in 30.degree. C. electroless copper plating solution composed of 7.5 g / L copper sulfate, 30 ml / L 37% formalin and 85 g / L Rochelle salt, and washed in water. The resulting material was immersed for 10 minutes in a 35.degree. C. electroless nickel solution contaning 30 g / L nickel sulfate, 20 g / L sodium hypophosphite and...

example 2

A nonwoven cloth (50 g / m.sup.2 in weight) composed of rayon long fiber (single thread denier of 2.0 d) was bonded with a foamed polyurethane sheet 1.6 mm thick having a cell density of 40 per inch by melt-bonding to produce a composite material 1.3 mm thick.

The test piece was subjected to the process similar to the one in Example 1 to produce a composite material with a uniformly-plated fiber surface and internal surface of the foam cell.

This material, as shown in Table 1, is superior in strength, electromagnetic wave shield property and conductivity.

example 3

A spun bonded nonwoven cloth (40 g / m.sup.2 in weight) composed of polyester long fiber (single thread denier of 2.0 d) was bonded with a foamed polyurethane sheet 3.5 mm thick having a cell density of 50 per inch by melt-bonding to produce a composite material 3.0 mm thick.

The test piece was subjected to the process similar to the one in Example 1 to produce a composite material with a uniformly-plated fiber surface and internal surface of the foam cell.

This material, as shown in Table 1, is superior in strength, electromagnetic wave shield property and conductivity.

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Abstract

A conductive material suitable as a gasket material for shielding the electromagnetic wave and a method of fabrication thereof are disclosed. The conductive material is intended to protect electronics equipment and devices from an erroneous operation which otherwise might be triggered by the electromagnetic wave leaking from other electronic equipment or devices and also to prevent a radio wave interference with communication equipment. A composite material sheet composed of a synthetic fiber-structured sheet and a porous synthetic resin sheet integrally bonded to each other is plated with a metal. In order to improve the working efficiency for final applications, an adhesive layer covered with the releasing paper is formed on one of the sheet surfaces.

Description

The present invention relates to a conductive material suitable as a gasket material for shielding the electromagnetic wave leaking mainly from electric devices and equipment and a method of manufacture thereof.DESCRIPTION OF THE RELATED ARTIn recent years, electronics equipment including personal computers, television games, portable telephone, and the like have come to be widely used and the ownership thereof has extended into home applications. With the expansion of the use of these equipment from industrial fields to home applications, the problem that the electromagnetic wave leaking from these equipment may cause an operation error of other electronics equipment and radio wave interference for communication equipment has become an increasingly serious subject of discussion in mass media.Under these circumstances, a demand is high in the electronics and related industries for an electromagnetic wave shielding material which exhibits an excellent masking effect for preventing va...

Claims

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Application Information

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IPC IPC(8): H05K9/00
CPCH05K9/0015Y10T442/648Y10T428/249958Y10T442/657Y10T442/654Y10T428/249953Y10T442/475Y10T442/655Y10T442/3398Y10T428/249981Y10T442/3333Y10T442/3407Y10T442/647Y10T442/481Y10T442/339Y10T442/3325Y10T442/469H05K9/00
Inventor SHIODA, SEIJIKATAYAMA, AKIHIDEKISHIMOTO, HIROOHIRANO, YOSHIYUKI
Owner SEIREN CO LTD